Louis, Underground Drifter

When Louis, Underground Drifter enters the
battlefield, if you don't control an artifact called
Yellowbird, create Yellowbird, a legendary 1/5
colourless artifact vehicle token with crew 1.
When Louis, Underground Drifter becomes
tapped, you may pay X. Reveal the top X cards
of your library and put any number of plains
into the battlefield tapped. Put the rest at the
bottom of your library in any order.